| For studying the genetic regularities of the main quantitative characters of flue-cured tobacco, seven varieties of which were adopted as parents, i.e. Yunyan 85(P1), L6-2-8(P2), Speight G80(P3), Zhongyan 98(P4), K326(P5), NC628(P6) and Coker371 Gold(P7).The 7 7 complete diallel crossing Combination was designed according to Griffing's method I in the year 2001.Field experimental performance tests were conducted in the tobacco experimental farm in the Tobacco Research Institute of The Anhui Academy of Agricultural Science in 2002.The field experiment was designed in accordance with the complete randomized blocks with three replications.The tested results of the 25 characters including plant height, stalk circumference, length of internode , leaf number, cutter length, cutter width ,tip leaf length, tip leaf width, leaf shape index(the ratio of cutter length to cutter width), output, output value, the average price, high grading leaves proportion, high and medium grading leaves proportion, the total nitrogen, total phosphorus, total potassium, total sugar, reducing sugar, nicotine, chlorineion, protein content, Schmuck value, ratio of sugar to alkali (ratio of reducing sugar to nicotine),ratio of potassium to chlorineion etc. These characters were divided into three categories as: the agronomic characters, the economic characters and the chemical components of flue-cured tobacco leaves. The tested results of there three categories were respectively undergone such statistical analysis as: analysis of variance, analysis of combining ability(including general combining ability, specific combining ability, specific reciprocal cross effect ),analysis of heritability and analysis of genetic variation by means of the DPS data process software procedures .The main experimental results acquired were as follows:The heredity of the main agronomical characters of flue-cured tobaccoThe heredity of plant height, stalk circumference,length of internode , leaf number, cutter length, tip leaf length is commonly controlled by additive effect gene and non-additive effect gene and plasmagene ; The heredity of cutter width and leaf shape index is controlled by both additive effect gene and non-additive effect gene, but not by plasmagene whereas that of tip leaf width is controlled by non-additive effect gene and plasmagene, not by additive effect gene .Among 3 characters including leaf number, cutter width and leaf shape index of flue-cured tobacco, the additive effect of gene is dominant (the ratio of GCA to SCA is more than 3); The ratio of GCA to SCA among 4 characters including the length of internode , cutter length, tip leaf length and tip leaf width is less than 1.0, it shows the non-additive effect of gene is dominant. The ratios of GCA to SCA about plant height and stalk circumference are 1.25 and 1.47 respectively, the additive effect of gene isdominant, and the non-additive effect of gene also takes a large part.The order of the heritability in broad sense h2B (%) of every agronomical characters was listed as follows: plant height (76.82) > leaf number (63.47) >length of internode (61.66) > stalk circumference (47.11) > leaf shape index (38.52) > cutter width (34.58) > tip leaf length (20.82) > tip leaf width (15.89) > cutter length (14.78).The order of the heritability in narrow sense h2N (%) of every agronomical characters was listed as follows: leaf number (55.27) > plant height (54.82) > leaf shape index(35.47) > stalk circumference (35.16) >length of internode (32.72) > cutter width (30.48) > tip leaf length (12.38) > cutter length (9.03) > tip leaf width (2.65).The heredity of the main economic characters of flue-cured tobaccoThe heredity of output and output value of flue-cured tobacco is commonly controlled by both additive effect gene and non-additive effect gene, but not by plasmagene. The ratio of GCA to SCA of output character is 0.59, that shows the non-additive effect of gene is dominant. The ratio of GCA to SCA of output value is 1.74, which shows the additive effect of gene is dominant and non-additive effect... |
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